arch/arm/mach-s3c64xx/irq-pm.c

   1 /* arch/arm/plat-s3c64xx/irq-pm.c
   2  *
   3  * Copyright 2008 Openmoko, Inc.
   4  * Copyright 2008 Simtec Electronics
   5  *      Ben Dooks <ben@simtec.co.uk>
   6  *      http://armlinux.simtec.co.uk/
   7  *
   8  * S3C64XX - Interrupt handling Power Management
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 /*
  16  * NOTE: Code in this file is not used when booting with Device Tree support.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/syscore_ops.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/serial_core.h>
  23 #include <linux/serial_s3c.h>
  24 #include <linux/irq.h>
  25 #include <linux/io.h>
  26 #include <linux/of.h>
  27
  28 #include <mach/map.h>
  29
  30 #include <mach/regs-gpio.h>
  31 #include <plat/cpu.h>
  32 #include <plat/pm.h>
  33
  34 /* We handled all the IRQ types in this code, to save having to make several
  35  * small files to handle each different type separately. Having the EINT_GRP
  36  * code here shouldn't be as much bloat as the IRQ table space needed when
  37  * they are enabled. The added benefit is we ensure that these registers are
  38  * in the same state as we suspended.
  39  */
  40
  41 static struct sleep_save irq_save[] = {
  42         SAVE_ITEM(S3C64XX_PRIORITY),
  43         SAVE_ITEM(S3C64XX_EINT0CON0),
  44         SAVE_ITEM(S3C64XX_EINT0CON1),
  45         SAVE_ITEM(S3C64XX_EINT0FLTCON0),
  46         SAVE_ITEM(S3C64XX_EINT0FLTCON1),
  47         SAVE_ITEM(S3C64XX_EINT0FLTCON2),
  48         SAVE_ITEM(S3C64XX_EINT0FLTCON3),
  49         SAVE_ITEM(S3C64XX_EINT0MASK),
  50 };
  51
  52 static struct irq_grp_save {
  53         u32     fltcon;
  54         u32     con;
  55         u32     mask;
  56 } eint_grp_save[5];
  57
  58 #ifndef CONFIG_SERIAL_SAMSUNG_UARTS
  59 #define SERIAL_SAMSUNG_UARTS 0
  60 #else
  61 #define SERIAL_SAMSUNG_UARTS CONFIG_SERIAL_SAMSUNG_UARTS
  62 #endif
  63
  64 static u32 irq_uart_mask[SERIAL_SAMSUNG_UARTS];
  65
  66 static int s3c64xx_irq_pm_suspend(void)
  67 {
  68         struct irq_grp_save *grp = eint_grp_save;
  69         int i;
  70
  71         S3C_PMDBG("%s: suspending IRQs\n", __func__);
  72
  73         s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
  74
  75         for (i = 0; i < SERIAL_SAMSUNG_UARTS; i++)
  76                 irq_uart_mask[i] = __raw_readl(S3C_VA_UARTx(i) + S3C64XX_UINTM);
  77
  78         for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
  79                 grp->con = __raw_readl(S3C64XX_EINT12CON + (i * 4));
  80                 grp->mask = __raw_readl(S3C64XX_EINT12MASK + (i * 4));
  81                 grp->fltcon = __raw_readl(S3C64XX_EINT12FLTCON + (i * 4));
  82         }
  83
  84         return 0;
  85 }
  86
  87 static void s3c64xx_irq_pm_resume(void)
  88 {
  89         struct irq_grp_save *grp = eint_grp_save;
  90         int i;
  91
  92         S3C_PMDBG("%s: resuming IRQs\n", __func__);
  93
  94         s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
  95
  96         for (i = 0; i < SERIAL_SAMSUNG_UARTS; i++)
  97                 __raw_writel(irq_uart_mask[i], S3C_VA_UARTx(i) + S3C64XX_UINTM);
  98
  99         for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
 100                 __raw_writel(grp->con, S3C64XX_EINT12CON + (i * 4));
 101                 __raw_writel(grp->mask, S3C64XX_EINT12MASK + (i * 4));
 102                 __raw_writel(grp->fltcon, S3C64XX_EINT12FLTCON + (i * 4));
 103         }
 104
 105         S3C_PMDBG("%s: IRQ configuration restored\n", __func__);
 106 }
 107
 108 static struct syscore_ops s3c64xx_irq_syscore_ops = {
 109         .suspend = s3c64xx_irq_pm_suspend,
 110         .resume  = s3c64xx_irq_pm_resume,
 111 };
 112
 113 static __init int s3c64xx_syscore_init(void)
 114 {
 115         /* Appropriate drivers (pinctrl, uart) handle this when using DT. */
 116         if (of_have_populated_dt() || !soc_is_s3c64xx())
 117                 return 0;
 118
 119         register_syscore_ops(&s3c64xx_irq_syscore_ops);
 120
 121         return 0;
 122 }
 123
 124 core_initcall(s3c64xx_syscore_init);